Appropriate number of biliary biopsies and endoscopic retrograde cholangiopancreatography sessions for diagnosing biliary tract cancer

Table 1 Comparison of patient characteristics between the positive group and the negative group

	P group (n = 76)	N group (n = 19)	P value
Age (yr)	75 (29-90)	68 (43-82)	0.012
Males	60 (78.9)	12 (63.2)	0.229
Received antithrombotic drugs	14 (18.4)	0 (0)	0.064
Location of tumor (distal/hilar)	45/31	8/11	0.205
UICC stage (1/2/3/4)	27/29/10/10	7/7/3/2	0.91
Cholangitis within the last month	10 (13.2)	3 (15.8)	0.719

The values are shown as the median (range) or n (%). P: Positive; N: Negative; UICC: Union for International Cancer Control.